mx2.zoho.com: "Reverse DNS does not match SMTP Banner"

mx2.zoho.com: "Reverse DNS does not match SMTP Banner"

I've run my domain through mxtoolbox and get the following warning,

smtp mx2.zoho.com warning "Reverse DNS does not match SMTP Banner"

I know it's only a warning and is not a problem but lots of people on here have already asked for it to be resolved so it is important to people.

I'm very keen for the warning to be resolved.
Regards.